CN105090553A - Combined ceramic ball core for ceramic ball valve and manufacturing technology of ball core - Google Patents
Combined ceramic ball core for ceramic ball valve and manufacturing technology of ball core Download PDFInfo
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- CN105090553A CN105090553A CN201510551686.8A CN201510551686A CN105090553A CN 105090553 A CN105090553 A CN 105090553A CN 201510551686 A CN201510551686 A CN 201510551686A CN 105090553 A CN105090553 A CN 105090553A
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- ceramic
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a combined ceramic ball core for a ceramic ball valve and a manufacturing technology of the ball core, and belongs to the technical field of universal valves. The combined ceramic ball core is formed by assembling a plurality of ceramic components. The ceramic components are in a ring piece shape after being divided along the plane perpendicular to the axis of a ceramic ball core flow channel through hole. The outer edge of each ring is a ball arc face, and the size of an inner hole of each ring is consistent with that of the flow channel through hole. The adjacent ceramic components are matched to form an integral ceramic ball core ball face and flow channel through hole structure. The number of the ceramic components is determined according to the size of the ceramic ball core and is preferably three or an odd number over three, that is, the ceramic components comprise one middle ball core piece component and an even number of left and right ball cap piece components in pairs, and accordingly production, manufacturing, machining and assembling are facilitated. The invention further discloses a manufacturing method of the combined ceramic ball core. By means of the combined ceramic ball core and the manufacturing technology of the ball core, the problem that traditional integrated ceramic ball cores are difficult to sinter due to the wall thickness difference is solved, and the manufacturing technology of the ball core is particularly suitable for production and manufacturing of large-aperture ceramic ball cores.
Description
Technical field
The present invention relates to a kind of valve spool of valve, belong to General valve technical field, particularly a kind of ceramic ball valve Combined ceramic ball core and preparation process thereof.
Background technique
Mostly the valve that current China every profession and trade is wear-resisting, corrosion-resistant pipeline is installed and used is metallic sealing section valve, but metallic material is because of the restriction of self-condition, more and more be difficult to the needs meeting the bad working environments such as modern industry high wearing and tearing, deep-etching, main manifestations is the problems such as wear and leakage is serious, working life is short, greatly have impact on the stability of system cloud gray model.Under this market demand, using stupalith alternative metals material to arise at the historic moment with the ceramic valve manufacturing sealed member and easily worn part, is representative especially with ceramic ball valve.Because ceramic ball valve adopts ceramic ball core, its high wear resistance and highly corrosion resistant are that the spool that metal material is made is incomparable, therefore have been widely used in the industry fields such as thermal power plant, iron and steel, Coal Chemical Industry, oil, chemical industry, papermaking, bioengineering.
But also there is certain difficulty in ceramic ball core body preparation technology.Uneven due to ceramic ball core wall thickness structure, two ends port is thinner and middle part is thicker, like this in sintering process densification difficulty, material the more difficult control of uniformity, especially for bigbore ceramic ball core, often easily producing middle wall thickness portion can not fully sintered, defect that internal density is low, thus makes properties not reach index.
The solution of prior art is generally by improving sintering temperature or extending holding time to ensure densified sintering product, but easily cause ceramic crystalline grain excessively grow up and occur breach, and for the ceramic ball core that bore is greater than DN200, because wall thickness is too thick, from great, during sintering, port cannot bear deadweight, often easily crack, thus cause decrease in yield, therefore ceramic ball core body makes the restriction by moulding process and sintering process, makes bigbore spheres of ceramic and compares and be difficult to realize.
Summary of the invention
The object of the present invention is to provide a kind of ceramic ball valve Combined ceramic ball core and preparation process thereof, adopt this Combined ceramic ball cored structure can not only improve spheres of ceramic yield rate, and the manufacture of heavy caliber spheres of ceramic can be realized, widen the application area of ceramic ball valve.
For achieving the above object, the present invention is by the following technical solutions:
A kind of ceramic ball valve Combined ceramic ball core, valve rod hole is offered on ball core body one top, is provided with runner through hole in the middle part of ball core body, and described ball core body is assembled by polylith ceramic component.
Each ceramic component of described composition ball core body divides by some planes perpendicular to described runner through-bore axis, each ceramic component is ring plate shape, ring outer rim is spherical cambered surface, ring hole size is consistent with described runner clear size of opening, and each adjacent ceramic component coordinates superposition composition bulk ceramics ball core body sphere and runner through-hole structure.
The quantity of the ceramic component of described composition ball core body is 3 pieces, 5 pieces or more odd number blocks, is positioned at middle centre of sphere sheet element comprising 1 piece, and somely lays respectively at the left and right ball cap sheet element of the paired even numbered blocks of centre of sphere sheet element bilateral symmetry.
Described centre of sphere sheet element ring outer edge surface is processed with one with the plane of centre of sphere sheet element lateral vertical, described valve rod hole to be arranged in described plane and to be symmetrical in the center line of described centre of sphere sheet element, and described valve rod hole is rectangle or oblong through hole or blind hole.
Described runner through hole pass is O type or V-type.
A preparation process for ceramic ball valve Combined ceramic ball core, comprises the following steps
1) raw material preparation
Yttrium stable zirconium oxide, yttrium stable zirconium oxide grog, aluminium vanadine, aluminium oxide, magnesium oxide and calcium oxide are weighed in proportion and mixes, then add PVA, Arabic gum, glycerine and deionized water formation mixture, after ball milling, obtain slip;
2) mist projection granulating
Above-mentioned slip enters spray drying tower granulation, and adds releasing agent;
3) shaping
The particle obtained joins in shaping die and carries out isostatic compaction process, obtains base substrate;
4) slightly repair
Above-mentioned base substrate is dried and is cooled to room temperature with the furnace, carries out roughing, burr equating by the shape and size of each component of ball core;
5) sinter
Thick repaired biscuit body is put into high temperature kiln sinter molding;
6) assemble
By each ceramic component assembling balling-up core body of above-mentioned sinter molding;
7) fine finishing
Ball core body after above-mentioned assembling is refined to size and the circularity of requirement.
The concrete steps of sintering are that thick repaired biscuit body is put into high temperature kiln 1450 ~ 1680 DEG C sintering, sintering time is 8 ~ 9 hours.
After base substrate being put into kiln in the step of sintering, vacuumize the degree of vacuum < 10 made in kiln
-2after mbar, be filled with argon gas, sinter under argon shield, warming velocity during sintering is 0.5 ~ 8 DEG C/min, cools to room temperature with the furnace and carry out fine finishing again after sintering time terminates.
In material preparation step, by ratio of weight and the number of copies, yttrium stable zirconium oxide gets 50 ~ 83 parts, yttrium stable zirconium oxide grog gets 5 ~ 40 parts, and aluminium vanadine gets 0.5 ~ 8 part, and aluminium oxide gets 0.1 ~ 0.5 part, magnesium oxide gets 0.03 ~ 0.2 part, calcium oxide gets 0.01 ~ 0.25 part, and PVA gets 0.5 ~ 3.5 part, and Arabic gum gets 0.1 ~ 2 part, glycerine gets 0.1 ~ 1.5 part, deionized water gets 123 ~ 130 parts, and Ball-milling Time is 12 ~ 38 hours, and it is 2.5:1 that grinding of ball grinder is situated between with the weight ratio of mixture.
Releasing agent in mist projection granulating step is dolomol, and the quality of dolomol is 0.2 ~ 0.5% of raw material gross mass.
After adopting technique scheme, the present invention is compared with background technique, and tool has the following advantages:
The full ceramic component structure of the present invention divides advantages of simple, when each flaky pottery component is prepared respectively, thickness difference is little, make each position can Even Sintering, and double-firing process can be carried out as required, improve yield rate, break away from the restriction of traditional ceramics ball core sintering process conditions, production process operability is high, bore can be realized and be greater than DN150, and even be greater than the manufacture of ceramic ball core of DN200, be particularly useful for the production of heavy caliber ceramic ball valve.
Accompanying drawing explanation
Fig. 1 is the DN300 bore ball valve Combined ceramic ball cored structure figure of embodiment 1.
Fig. 2 is ball valve Combined ceramic ball core intermediate lamination element structure figure.
Fig. 3 is the DN500 bore ball valve Combined ceramic ball cored structure figure of embodiment 2.
Fig. 4 is the centre centre of sphere sheet element schematic diagram of embodiment 2.
Fig. 5 is the DN800 bore ball valve Combined ceramic ball cored structure figure of embodiment 3.
Fig. 6 is the process flow diagram of ceramic ball valve Combined ceramic ball core of the present invention.
Embodiment
In order to make object of the present invention, technological scheme and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 is the DN300 bore ball valve Combined ceramic ball cored structure figure of embodiment 1.Ceramic ball valve spool caliber size shown in figure is DN300, is provided with cylindrical flow through hole in the middle part of ball core, is made up of three ceramic components divided along two planes perpendicular to described runner through-bore axis.Each ceramic component is made with zirconia ceramics or aluminium oxide ceramics or alumina toughened zircon pottery, each ceramic component is ring plate shape, ring outer rim is spherical cambered surface, ring hole size is consistent with described runner clear size of opening, each adjacent ceramic component is integrated by the methods combining of gluing, soldering, welding process or twice firing, forms ceramic ball core body sphere and cylindrical flow through hole.
Fig. 2 is the centre centre of sphere sheet element schematic diagram of embodiment 1.As shown in the figure, described centre of sphere sheet element ring outer edge surface is processed with one with the plane of centre of sphere sheet element lateral vertical, described valve rod hole to be arranged in described plane and to be symmetrical in the center line of described centre of sphere sheet structure, and in the present embodiment, valve rod hole is long-round-shape through hole.
Fig. 3 is the DN500 bore ball valve Combined ceramic ball cored structure figure of embodiment 2.Difference from Example 1 is the bore of ceramic ball valve spool and the ceramic block quantity difference of composition ceramic valve core; Valve hole shape is different; Runner shape of through holes is different.In the present embodiment, the bore of ceramic ball valve spool is DN500, is made up of 5 pieces of ceramic blocks; Valve hole shape is rectangle blind hole; Runner through hole is V-arrangement, sees the centre centre of sphere sheet element schematic diagram of the embodiment 2 of Fig. 4.
Fig. 5 is the DN800 bore ball valve Combined ceramic ball cored structure figure of embodiment 3.Difference from Example 1 is the bore of ceramic ball valve spool and the ceramic block quantity difference of composition ceramic valve core, and in the present embodiment, the bore of ceramic ball valve spool is DN800, is made up of 9 pieces of ceramic blocks.
In employing above-described embodiment, after Split type ceramic ball cored structure, each ceramic block is little from heavy and light, thickness thickness difference that is thin, centerand edge, make ceramic block each position energy Even Sintering, make the production process summary of spheres of ceramic, production process operability improves, and is beneficial to the manufacture realizing heavy caliber ceramic ball valve.Certainly, the division of ceramic component also can be carried out along other reasonable direction, and the quantity of ceramic component also can adjust according to the size of formed spheres of ceramic flexibly, the thickness be designed so that each ceramic component all easily sinters, processing.
Present invention also offers a kind of preparation process of ball valve Combined ceramic ball core, shown in composition graphs 6, it comprises the following steps:
1) by ratio of weight and the number of copies, the calcium oxide of the yttrium stable zirconium oxide of 50 ~ 83 parts, the yttrium stable zirconium oxide grog of 5 ~ 40 parts, the aluminium vanadine of 0.5 ~ 8 part, the aluminium oxide of 0.1 ~ 0.5 part, the magnesium oxide of 0.03 ~ 0.2 part and 0.01 ~ 0.25 part is weighed in proportion and mixes, add the PVA (polyvinyl alcohol) of 0.5 ~ 3.5 part, 0.1 ~ 2 part of Arabic gum, 0.1 ~ 1.5 part of glycerine and 123 ~ 130 parts of deionized waters again, after ball milling, obtain slip;
The present embodiment adopts: yttrium stable zirconium oxide 75 parts, 21 parts, yttrium stable zirconium oxide grog, aluminium vanadine 3.5 parts, 0.35 part, aluminium oxide, 0.15 part, magnesium oxide and 0.1 part, calcium oxide, after main raw material weighs with platform scale, conveyor belt delivers to batch hopper, enters mill after the metering of small powder electronic scale.
Add PVA2 part, Arabic gum 1 part, glycerine 0.6 part and deionized water 125 parts during ball milling again to mix, mixture obtains slip through the ball milling of 12 ~ 38 hours, and it is 2.5:1 that grinding of ball grinder is situated between with the weight ratio of mixture.
Pebble mill adds cooling water circulation cooling bucket wall while starting, maintain slurry lower than 50 DEG C, open size circulations pump, midge at the bottom of bucket and entering from bucket top, and slurry turns, and strengthens grinding efficiency.
2) mist projection granulating, above-mentioned slip enters spray drying tower granulation, and adds releasing agent;
Slurry is pressed into spray drying tower through plunger type charging pump with 2MPa, spray drying tower outlet temperature 110 DEG C, air negative pressure 250 ~ 350Pa in tower, slurry is atomized by rifle head, hyperthermia drying forms homogeneous spherical particle and completes granulation process, and granule water tariff collection 3% ~ 5%, and adds releasing agent in right amount, releasing agent adopts dolomol, and the quality of dolomol is 0.2 ~ 0.5% of raw material gross mass.
Particle is through vibrating sieve 60 order and the screening of 200 orders bilayer, and the acceptable product wherein between 60 orders and 200 orders can enter next step operation;
3) shaping, the particle obtained joins in shaping die and carries out cold isostatic compaction process and obtain base substrate;
To make powder particles loads in mould, hang in cold isostatic press oil hydraulic cylinder after good seal, the demoulding after 180 ~ 200MPa pressure compacting pressurize, make tubular blank, shell expansion tooling is got on the bus segment after wheeled litter cylindrical, pipeline section cylindrical again car becomes sphere, and spheroid cuts into polylith ball cap sheet or centre of sphere sheet element blank.
4) slightly repair, above-mentioned blank body puts into baking box dries, and controls bake out temperature at about 280 DEG C, drying time 1 hour, obtain the biscuit setting up initial strength after cooling to room temperature with the furnace, biscuit is carried out roughing, burr equating by the designing shape of each component of ball core and size;
Owing to limiting by actual production process conditions, ceramic ball component blank shape after shaping irregularity, usually need to carry out correction of the flank shape processing before sintering, make it reach certain size and accuracy to shape, to reduce the machining allowance after sintering, this has extremely important effect to reduction cost of production.
5) sinter, thick repaired biscuit body is put into high temperature kiln sinter molding
Thick repaired biscuit body is put into high temperature kiln 1450 ~ 1680 DEG C sintering, sintering time is 8 ~ 9 hours.In high temperature sintering, after base substrate is put into kiln, vacuumize the degree of vacuum < 10 made in kiln
-2after mbar, be filled with argon gas, sinter under argon shield, warming velocity during sintering is 0.5 ~ 8 DEG C/min, cools to room temperature with the furnace after sintering time terminates, then carries out fine finishing.
6) assemble
By each ceramic component assembling balling-up core body of above-mentioned sinter molding, the end face of each ceramic component fits tightly mutually, and interior available high-temp and high-strength glue fills bonding firmly, except by gluing, soldering or welding process also can be adopted to be combined as a whole.
7) fine finishing, is refined to size and the circularity of requirement by the ball core body after above-mentioned assembling
Accurately machined step is specially 1, grinds endoporus, is fixed on by spheres of ceramic on lathe, grinding machine or special purpose machine tool, carries out runner through hole and the valve rod hole grinding of O type or V-type, make hole size meet designing requirement; 2, sphere processing, be first clamped on spheric grinding machine by spheres of ceramic recruitment dress, grinding to the size required and circularity, then is undertaken refining and polishing by shaping polissoir, completes the course of working of ceramic valve ball.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. a ceramic ball valve Combined ceramic ball core, valve rod hole is offered on ball core body one top, is provided with runner through hole, it is characterized in that in the middle part of ball core body: described ball core body is assembled by polylith ceramic component.
2. a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 1, it is characterized in that: each ceramic component of described composition ball core body divides by some planes perpendicular to described runner through-bore axis, each ceramic component is ring plate shape, ring outer rim is spherical cambered surface, ring hole size is consistent with described runner clear size of opening, and each adjacent ceramic component coordinates superposition composition bulk ceramics ball core body sphere and runner through-hole structure.
3. a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 2, it is characterized in that: the quantity of the ceramic component of described composition ball core body is 3 pieces, 5 pieces or more odd number blocks, be positioned at middle centre of sphere sheet element comprising 1 piece, and somely lay respectively at the left and right ball cap sheet element of the paired even numbered blocks of centre of sphere sheet element bilateral symmetry.
4. a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 3, it is characterized in that: the plane described centre of sphere sheet element ring outer edge surface being processed with one and centre of sphere sheet element lateral vertical, described valve rod hole to be arranged in described plane and to be symmetrical in the center line of described centre of sphere sheet element, and described valve rod hole is rectangle or oblong through hole or blind hole.
5. a kind of ceramic ball valve Combined ceramic ball core as described in any one of Claims 1-4, is characterized in that: described runner through hole pass is O type or V-type.
6. a ceramic ball valve preparation process for Combined ceramic ball core, is characterized in that: comprise the following steps
1) raw material preparation
Yttrium stable zirconium oxide, yttrium stable zirconium oxide grog, aluminium vanadine, aluminium oxide, magnesium oxide and calcium oxide are weighed in proportion and mixes, then add PVA, Arabic gum, glycerine and deionized water formation mixture, after ball milling, obtain slip;
2) mist projection granulating
Above-mentioned slip enters spray drying tower granulation, and adds releasing agent;
3) shaping
The particle obtained joins in shaping die and carries out isostatic compaction process, obtains base substrate;
4) slightly repair
Above-mentioned base substrate is dried and is cooled to room temperature with the furnace, carries out roughing, burr equating by the shape and size of each component of ball core;
5) sinter
Thick repaired biscuit body is put into high temperature kiln sinter molding;
6) assemble
By each ceramic component assembling balling-up core body of above-mentioned sinter molding;
7) fine finishing
Ball core body after above-mentioned assembling is refined to size and the circularity of requirement.
7. the preparation process of a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 6, it is characterized in that: the concrete steps of sintering are, thick repaired biscuit body is put into high temperature kiln 1450 ~ 1680 DEG C sintering, sintering time is 8 ~ 9 hours.
8. the preparation process of a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 6, is characterized in that: after base substrate being put into kiln in the step of sintering, vacuumize the degree of vacuum < 10 made in kiln
-2after mbar, be filled with argon gas, sinter under argon shield, warming velocity during sintering is 0.5 ~ 8 DEG C/min, cools to room temperature with the furnace and carry out fine finishing again after sintering time terminates.
9. the preparation process of a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 6, it is characterized in that: in material preparation step, by ratio of weight and the number of copies, yttrium stable zirconium oxide gets 50 ~ 83 parts, yttrium stable zirconium oxide grog gets 5 ~ 40 parts, aluminium vanadine gets 0.5 ~ 8 part, aluminium oxide gets 0.1 ~ 0.5 part, magnesium oxide gets 0.03 ~ 0.2 part, calcium oxide gets 0.01 ~ 0.25 part, PVA gets 0.5 ~ 3.5 part, Arabic gum gets 0.1 ~ 2 part, glycerine gets 0.1 ~ 1.5 part, deionized water gets 123 ~ 130 parts, Ball-milling Time is 12 ~ 38 hours, it is 2.5:1 that grinding of ball grinder is situated between with the weight ratio of mixture.
10. the preparation process of a kind of ceramic ball valve Combined ceramic ball core as claimed in claim 6, it is characterized in that: the releasing agent in mist projection granulating step is dolomol, the quality of dolomol is 0.2 ~ 0.5% of raw material gross mass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510551686.8A CN105090553B (en) | 2015-09-01 | 2015-09-01 | A kind of ceramic ball valve Combined ceramic core and its manufacture craft |
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| CN201510551686.8A CN105090553B (en) | 2015-09-01 | 2015-09-01 | A kind of ceramic ball valve Combined ceramic core and its manufacture craft |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407565A (en) * | 2019-08-07 | 2019-11-05 | 上海泛联科技股份有限公司 | A kind of metering pump ceramic valve ball and preparation method thereof |
| US20220033315A1 (en) * | 2020-07-31 | 2022-02-03 | Xinxing Electronic Ceramics Co., Ltd | Preparation method of alumina ceramic valve core ceramic chip and product thereof |
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| CN205026134U (en) * | 2015-09-01 | 2016-02-10 | 厦门胜中流体控制技术有限公司 | Pottery is combination formula pottery ball core for ball valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110407565A (en) * | 2019-08-07 | 2019-11-05 | 上海泛联科技股份有限公司 | A kind of metering pump ceramic valve ball and preparation method thereof |
| US20220033315A1 (en) * | 2020-07-31 | 2022-02-03 | Xinxing Electronic Ceramics Co., Ltd | Preparation method of alumina ceramic valve core ceramic chip and product thereof |
| US11834380B2 (en) * | 2020-07-31 | 2023-12-05 | Xinxing Electronic Ceramics Co., Ltd | Preparation method of alumina ceramic valve core ceramic chip and product thereof |
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| Publication number | Publication date |
|---|---|
| CN105090553B (en) | 2018-05-25 |
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